Hi there,
I was outside and noticed the exterior combustion intake and exhaust PVC vents for our high-efficiency furnace were blowing air through them. I can hear and feel it, but it is hard to tell if they’re blowing or sucking as it’s not a lot of air.
I did some checking and confirmed the furnace is in the cooling mode and the venter motor is off, but the blower fan is on (re-circulating the air).
Is this a symptom of a cracked heat exchanger, possibly another issue, or is this normal?
Thanks in advance.
I was outside and noticed the exterior combustion intake and exhaust PVC vents for our high-efficiency furnace were blowing air through them. I can hear and feel it, but it is hard to tell if they’re blowing or sucking as it’s not a lot of air.
I did some checking and confirmed the furnace is in the cooling mode and the venter motor is off, but the blower fan is on (re-circulating the air).
Is this a symptom of a cracked heat exchanger, possibly another issue, or is this normal?
Thanks in advance.
source https://hvac-talk.com/vbb/threads/2242296-Hi-Eff-Furnace-Combustion-Vents-Moving-Air-During-Cooling?goto=newpost
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